Comment 6 for bug 579866

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John McCabe-Dansted (gmatht) wrote : Re: 10.04 and 10.10 Install formatted ext3 partition (data lost)

BTW, you can recover some files from a formatted partition. See e.g. PhotoRec. There are also more powerful proprietary tools that can recover pretty much everything including directory structure. That said WHY?

I just did this on 12.04. I chose ext4 in the Edit partition dialog box. I noted that the format box was unchecked. I ticked OK. The format box was in the "Install" dialog was STILL unchecked. I hit "Install Now". The precise moment I pressed "Install Now" it added a tick in the "Format?". I quickly tried to stop the install, but by the time I had it had already been formatted.

As I understand Ubiquity has a two second delay before it adds the tick to the "Format?" column; this allows the user to check twice (i.e in both dialogs) that the format box hasn't been checked, and still have their partition formatted under them.